Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1da0d35104d985c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 13:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1f5412a50804f9c5b97a6e06598aedb7 SHA-1: 3d7091c8aaa9973af22206104c6164867834baae SHA-256: b1da0d35104d985cfecb2bf0958c8370c57ed19b3928cf1a97e1878a6f0f1cdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/9smk7566uq42rs4r48pa2hfn2e/kevuna.pdf In PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/76502352127.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700dbb2097e---teponofibedatonuju.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/97095491490.pdfIn PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/1326025451.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/53428292281.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/58640559297.pdfIn PDF document text
    • https://efnnma.org/files/file/96979488079.pdfIn PDF document text
    • https://beldaoyun.com/calisma2/files/uploads/15161352036.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/cc0cee580be2f5c1bb81dad43d0e07f3/pikonebun.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce57c3c9ca---firevameze.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076751e1a9b2---43623753266.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/wutemudubagobodogakisoki.pdfIn PDF document text
    • http://intertribo.sk/files/wevuruvadedemikifufasefo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609650d102c4c---gasimavemudibego.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/8517426556.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/defuvawewu.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/wemazis.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce98655a760---408374645.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a825ed37d53---58458496499.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/revisemeredeb.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/92139089571.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/qecq35uud9rbdgkescr74q2bbu/xelisuluzajim.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d711add1f---tugofutotobidizedalos.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16109ff04c60b3---45278015504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=mail+merge+pdf+wordPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 17896 bytes
SHA-256: 6abb4d47d0b67604025efc8cfd0218938673f5ab37ac9b4ad3ffa33ef27ddb83
font_01_sfnt_off00010a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A57 10548 bytes
SHA-256: 8323c6285951cbeb7eca88d0cc5c82b54fc63dfc645cd2052b26e11a9699bbff
font_02_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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